Overall, only 22 percent of voters think the president should veto it -- which he has threatened to do.

The U.S. House passed a bill approving the pipeline Friday. The Senate is now considering Keystone legislation, but there won’t be a final vote this week.

Support for Keystone has held steady for years: 68 percent of voters backed it at the end of 2014, 70 percent in 2013 and 67 percent in 2012.

Here again, support comes from more than half of Democrats, most independents and almost all Republicans.

The Fox News poll is based on landline and cell phone interviews with 1,018 randomly chosen registered voters nationwide and was conducted under the joint direction of Anderson Robbins Research (D) and Shaw & Company Research (R) from January 11-13, 2015. The full poll has a margin of sampling error of plus or minus three percentage points.